Geometry > Symmetry Cut > WorldSpace_X(Weld)... Remove the side of a mesh which has less geometry than the other side and replace it with a new part symmetrical to the otherside. A symmetry information about the mesh will be created and can be used by other tools to perform transforming or modifying smmetrically. The object pivot and mesh pivot will be set accordingly.
Geometry > Symmetry Cut > Remove LessGeo Side(Weld)... Remove one side of a mesh which has less geometry than the other side and replace it with a new part symmetrical to the other side. A symmetry information about the mesh will be created and can be used by other tools to perform transforming or modifying symmetrically. \rIf there is no mesh right under cursor, all the visible and unfreezed meshes of all the selected objects will be symmetrized, otherwize only the under cursor mesh will be symmetrized.
Update Notes By Jun 03 2017
When transforming/rotating/scaling/extruding/chamfering/Shelling/... scene items by draging either in viewport or in a control, to achieve fine adjustment, press down and hold Ctrl key during the operation.
Edit > Options > File Format Options > dxf > Import lines and isolated vertices. POLYLINE from dxf will be converted to spline objects. The isolated vertices will be wrapped into an object called "DXF_ISO_Verts_Only". Faces should be created base on these isolated vertices so they can be used as snapping objects for precision modeling.
Splines can be exported to dxf as poly lines.
View > Object Shading > Show Edges On Frozen.
Universal Loop Selection(Range/Gap) is improved. If the existing selection is only one subobject, whole mesh selection grow or edge loop selection will be performed. This new feature can be useful for tablet pen users.
View > Use World Space Navigation (Selected). Toggle the flag of the current selected viewport which decides using World space or Workplane space as navigation space. This option can be useful for some viewports to have World space navigation while others have Workplane space navigation.